Fig. 4. Ratio of lactate dehydrogenase to citrate synthase (LDH/CS) activity in gastrocnemius muscle of mammals of different body masses (M_b). The symbols represent data for Suncus etruscus () and Crocidura russula () (Peters et al., 1999) together with those for the shrew Sorex vagrans (body mass 4-5 g) ([UNK]) and several larger mammals (), taken from Emmett and Hochachka (1981). The solid line is the result of a linear regression on a double-logarithmic scale in which all data points were included: log(LDH/CS)=0.304logM_b+0.623; r²=0.62).